I found a hole about half the size of a baseball in the bottom of the bellhousing just behind the inspection plate.Nothing is leaking the trans shifts fine. 71 mach1 C6 is this any thing to be concerned about?
you don't have anything to worry about other than dirt and moisture getting inside your bellhousing. If you only drive on nice sunny days then this doesn't apply. If it bothers you, go to your local machinist/mechanic and have him weld up an aluminum patch on the bottom of the bell. Shouldn't be much more than 50 bucks or so.